GOMAPCOUNTS provides the "map count" (i.e. the count of mapped keys) for each map in package GO.db.
This "map count" information is precalculated and stored in the
package annotation DB. This allows some quality control and is used by
function defined in AnnotationDbi to compare and validate different
sum(!is.na(as.list(x)))) for getting the "map count" of a given
AnnotationDb-class for use of
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## select() interface: ## Objects in this package can be accessed using the select() interface ## from the AnnotationDbi package. See ?select for details. ## Bimap interface: GOMAPCOUNTS mapnames <- names(GOMAPCOUNTS) GOMAPCOUNTS[mapnames] x <- get(mapnames) sum(!is.na(as.list(x))) count.mappedkeys(x) # much faster! ## Check the "map count" of all the maps in package GO.db checkMAPCOUNTS("GO.db")
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